Local Corrosion Behaviors in the Coarse-Grained Heat-Affected Zone in a Newly Developed Zr-Ti-Al-RE Deoxidized High-Strength Low-Alloy Steel

Oxide metallurgy technology can improve the microstructure of a coarse-grained heat-affected zone (CGHAZ) but introduces extra inclusions. Local corrosion behavior of the CGHAZ of a Zr-Ti-Al-RE deoxidized steel was investigated in this work using theoretical calculations and experimental verificatio...

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Published in:Materials 2023-01, Vol.16 (2), p.876
Main Authors: Yin, Chao-Chao, Cheng, Lin, Wang, Zhi-Hui, Zhao, Tian-Liang, Cheng, Shi, Hu, Shu-E, Liu, Zi-Cheng, Luo, Deng, Xiao, Da-Heng, Jin, Xing, Liu, Han-Kun, Wu, Kai-Ming
Format: Article
Language:English
Subjects:
Acidification
Aluminum
Calcium sulfides
Corrosion resistance
Electrodes
Heat
Heat affected zone
High strength low alloy steels
Inclusions
Magnesium
Mechanical properties
Metallurgy
Microstructure
Morphology
Pitting (corrosion)
Software
Steel
Titanium
Zirconium
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Summary:Oxide metallurgy technology can improve the microstructure of a coarse-grained heat-affected zone (CGHAZ) but introduces extra inclusions. Local corrosion behavior of the CGHAZ of a Zr-Ti-Al-RE deoxidized steel was investigated in this work using theoretical calculations and experimental verification. The modified inclusions have a (Zr-Mg-Al-Ca-RE)O core claded by a CaS and TiN shell. CaS dissolves first, followed by the oxide core, leaving TiN parts. This confirms that the addition of rare earth can reduce lattice distortion and prevent a galvanic couple between the inclusions and the matrix, while the chemical dissolution of CaS causes localized acidification, resulting in the pitting corrosion initiation.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16020876